Index: DamClients/DamUI/trunk/src/DamClientsLibrary/Deltares.Dam.StixFileReader/Deltares.Dam.StixFileReader.csproj
===================================================================
diff -u -r4803 -r6159
--- DamClients/DamUI/trunk/src/DamClientsLibrary/Deltares.Dam.StixFileReader/Deltares.Dam.StixFileReader.csproj	(.../Deltares.Dam.StixFileReader.csproj)	(revision 4803)
+++ DamClients/DamUI/trunk/src/DamClientsLibrary/Deltares.Dam.StixFileReader/Deltares.Dam.StixFileReader.csproj	(.../Deltares.Dam.StixFileReader.csproj)	(revision 6159)
@@ -15,6 +15,9 @@
         <Reference Include="Deltares.Geotechnics">
             <HintPath>..\..\..\lib\DSL-Geo\Deltares.Geotechnics.dll</HintPath>
         </Reference>
+        <Reference Include="Deltares.Mathematics">
+          <HintPath>..\..\..\lib\DSL-Core\Deltares.Mathematics.dll</HintPath>
+        </Reference>
         <Reference Include="Deltares.Standard">
             <HintPath>..\..\..\lib\DSL-Core\Deltares.Standard.dll</HintPath>
         </Reference>
Index: DamClients/DamUI/trunk/src/DamClientsLibrary/Deltares.Dam.StixFileReader.Tests/PersistableDataModelFactory.cs
===================================================================
diff -u -r6112 -r6159
--- DamClients/DamUI/trunk/src/DamClientsLibrary/Deltares.Dam.StixFileReader.Tests/PersistableDataModelFactory.cs	(.../PersistableDataModelFactory.cs)	(revision 6112)
+++ DamClients/DamUI/trunk/src/DamClientsLibrary/Deltares.Dam.StixFileReader.Tests/PersistableDataModelFactory.cs	(.../PersistableDataModelFactory.cs)	(revision 6159)
@@ -415,4 +415,159 @@
             }
         };
     }
+
+    /// <code>
+    ///        |-----------------------------------------------------------------|
+    ///        |                                                                 |
+    ///        |                     bottom of layer 2                           |
+    ///        |                 |---------------------|                         |
+    ///        |                 |                     |                         |
+    ///        |  layer 2        |                     |                         |
+    ///        |                 |                     |                         |
+    ///        |                 |    layer 3          |                         |
+    ///        |                 |                     |                         |
+    ///        |                 |                     |                         |
+    ///        |                 |                     |                         |
+    ///        |-----------------|---------------------|-------------------------|
+    ///        |                  layer 1                                        |
+    ///        |-----------------------------------------------------------------|
+    /// </code>
+    /// <summary>
+    /// Factory for creating a simple <see cref="PersistableDataModel" /> containing a layer
+    /// for which all the points are also in another surrounding layer,
+    /// but it is not an inner loop.
+    /// </summary>
+    /// <returns></returns>
+    public static PersistableDataModel CreateSimpleDataModelWithLayerThatIsNotAnInnerLoop()
+    {
+        return new PersistableDataModel
+        {
+            Scenarios = new List<PersistableScenario>
+            {
+                new()
+                {
+                    Stages = new List<PersistableStage>
+                    {
+                        new()
+                        {
+                            GeometryId = "15",
+                            SoilLayersId = "20"
+                        }
+                    }
+                }
+            },
+            Geometry = new List<PersistableGeometry>
+            {
+                new()
+                {
+                    Id = "15",
+                    Layers = new List<PersistableLayer>
+                    {
+                        new()
+                        {
+                            Id = "16",
+                            Points = new List<PersistablePoint>
+                            {
+                                new(10, -6),
+                                new(10, -5),
+                                new(60, -5),
+                                new(60, -6)
+                            }
+                        },
+                        new()
+                        {
+                            Id = "17",
+                            Points = new List<PersistablePoint>
+                            {
+                                new(10, -5),
+                                new(10, 5),
+                                new(60, 5),
+                                new(60, -5),
+                                new(30, -5),
+                                new(30, 4),
+                                new(20, 4),
+                                new(20, -5)
+                            }
+                        },
+                        new()
+                        {
+                            Id = "18",
+                            Points = new List<PersistablePoint>
+                            {
+                                new(20, -5),
+                                new(20, 4),
+                                new(30, 4),
+                                new(30, -5)
+                            }
+                        },
+                    }
+                }
+            },
+            SoilLayers = new List<PersistableSoilLayerCollection>
+            {
+                new()
+                {
+                    Id = "20",
+                    SoilLayers = new List<PersistableSoilLayer>
+                    {
+                        new()
+                        {
+                            LayerId = "16",
+                            SoilId = "12"
+                        },
+                        new()
+                        {
+                            LayerId = "17",
+                            SoilId = "13"
+                        },
+                        new()
+                        {
+                            LayerId = "18",
+                            SoilId = "7"
+                        }
+                    }
+                }
+            },
+            Soils = new PersistableSoilCollection
+            {
+                Soils = new List<PersistableSoil>
+                {
+                    new()
+                    {
+                        Id = "7"
+                    },
+                    new()
+                    {
+                        Id = "12"
+                    },
+                    new()
+                    {
+                        Id = "13"
+                    }
+                }
+            },
+            SoilVisualizations = new PersistableSoilVisualizationCollection
+            {
+                SoilVisualizations = new List<PersistableSoilVisualization>
+                {
+                    new()
+                    {
+                        SoilId = "7",
+                        Color = ColorTranslator.FromHtml("#80657F22")
+                    },
+                    new()
+                    {
+                        SoilId = "12",
+                        Color = ColorTranslator.FromHtml("#80FFCC00")
+                    },
+                    new()
+                    {
+                        SoilId = "13",
+                        Color = ColorTranslator.FromHtml("#80BB8800")
+                    }
+                }
+            }
+        };
+    }
+    
 }
\ No newline at end of file
Index: DamClients/DamUI/trunk/src/DamClientsLibrary/Deltares.Dam.StixFileReader/SoilProfile2DDataModel.cs
===================================================================
diff -u -r6112 -r6159
--- DamClients/DamUI/trunk/src/DamClientsLibrary/Deltares.Dam.StixFileReader/SoilProfile2DDataModel.cs	(.../SoilProfile2DDataModel.cs)	(revision 6112)
+++ DamClients/DamUI/trunk/src/DamClientsLibrary/Deltares.Dam.StixFileReader/SoilProfile2DDataModel.cs	(.../SoilProfile2DDataModel.cs)	(revision 6159)
@@ -26,6 +26,7 @@
 using Components.Persistence.Stability.Version2.Data;
 using Deltares.Geometry;
 using Deltares.Geotechnics.Soils;
+using Deltares.Mathematics;
 
 namespace Deltares.Dam.StixFileReader;
 
@@ -230,10 +231,12 @@
                     continue;
                 }
                 GeometryLoop loop2 = soilProfile.Surfaces[index2].GeometrySurface.OuterLoop;
-                bool allPointsInLoop2AreInLoop1 = loop2.Points.All(loop1.IsPointInLoopArea);
-                if (allPointsInLoop2AreInLoop1)
+                if (loop2.Points.All(loop1.IsPointInLoopArea))
                 {
-                    layerConnections.Add(new LayerConnection(index2, index1, loop1.Area()));
+                    if (CentroidOfLoop2IsInLoop1(loop2, loop1))
+                    {
+                        layerConnections.Add(new LayerConnection(index2, index1, loop1.Area()));
+                    }
                 }
             }
         }
@@ -255,4 +258,13 @@
             }
         }
     }
+
+    private static bool CentroidOfLoop2IsInLoop1(GeometryLoop loop2, GeometryLoop loop1)
+    {
+        List<Point2D> loop2Points = loop2.GetLocalPoint2DList();
+        Point2D centroidOfLoop2Point2D = Routines2D.DeterminePolygonCentroid(loop2Points);
+        var centroidOfLoop2 = new GeometryPoint(centroidOfLoop2Point2D.X, 0, centroidOfLoop2Point2D.Y);
+        bool centroidOfLoop2IsInLoop1 = loop1.IsPointInLoopArea(centroidOfLoop2);
+        return centroidOfLoop2IsInLoop1;
+    }
 }
\ No newline at end of file
Index: DamClients/DamUI/trunk/src/DamClientsLibrary/Deltares.Dam.StixFileReader.Tests/SoilProfile2DDataModelTest.cs
===================================================================
diff -u -r6112 -r6159
--- DamClients/DamUI/trunk/src/DamClientsLibrary/Deltares.Dam.StixFileReader.Tests/SoilProfile2DDataModelTest.cs	(.../SoilProfile2DDataModelTest.cs)	(revision 6112)
+++ DamClients/DamUI/trunk/src/DamClientsLibrary/Deltares.Dam.StixFileReader.Tests/SoilProfile2DDataModelTest.cs	(.../SoilProfile2DDataModelTest.cs)	(revision 6159)
@@ -210,4 +210,19 @@
             Assert.That(soilProfile2D.Geometry.Surfaces.ElementAt(1).InnerLoops.ElementAt(0).CurveList, Has.Count.EqualTo(4));
         });
     }
+    
+    [Test]
+    public void WhenCreateDataModelWithLayerThatIsNotAnInnerLoop_ThenSoilProfile2DIsAsExpected()
+    {
+        const double shift = 0;
+        PersistableDataModel dataModel = PersistableDataModelFactory.CreateSimpleDataModelWithLayerThatIsNotAnInnerLoop();
+        SoilProfile2D soilProfile2D = new SoilProfile2DDataModel().Create(dataModel, 0);
+
+        Assert.That(soilProfile2D.Geometry.Surfaces, Has.Count.EqualTo(3));
+        Assert.Multiple(() =>
+        {
+            Assert.That(soilProfile2D.Geometry.Surfaces.ElementAt(1).OuterLoop.CurveList, Has.Count.EqualTo(8));
+            Assert.That(soilProfile2D.Geometry.Surfaces.ElementAt(1).InnerLoops, Has.Count.EqualTo(0));
+        });
+    }
 }
\ No newline at end of file