diff --git a/src/main/java/fr/openmc/core/registry/regions/CustomRegion.java b/src/main/java/fr/openmc/core/registry/regions/CustomRegion.java
index ce85d7a4a..b5866b083 100644
--- a/src/main/java/fr/openmc/core/registry/regions/CustomRegion.java
+++ b/src/main/java/fr/openmc/core/registry/regions/CustomRegion.java
@@ -10,8 +10,8 @@ public abstract class CustomRegion {
     public abstract World getWorld();
 
     public abstract boolean contains(BlockVector3 pos);
-    public abstract BlockVector3 getMin();
-    public abstract BlockVector3 getMax();
+    public abstract BlockVector3 getPos1();
+    public abstract BlockVector3 getPos2();
 
     public final boolean contains(Location loc) {
         if (loc == null || loc.getWorld() == null) return false;
diff --git a/src/main/java/fr/openmc/core/registry/regions/content/ExampleRegion.java b/src/main/java/fr/openmc/core/registry/regions/content/ExampleRegion.java
index 83db314d4..5d2322faf 100644
--- a/src/main/java/fr/openmc/core/registry/regions/content/ExampleRegion.java
+++ b/src/main/java/fr/openmc/core/registry/regions/content/ExampleRegion.java
@@ -17,12 +17,12 @@ public World getWorld() {
     }
 
     @Override
-    public BlockVector3 getMin() {
+    public BlockVector3 getPos1() {
         return null;
     }
 
     @Override
-    public BlockVector3 getMax() {
+    public BlockVector3 getPos2() {
         return null;
     }
 }
diff --git a/src/main/java/fr/openmc/core/registry/regions/types/Region.java b/src/main/java/fr/openmc/core/registry/regions/types/Region.java
index c9ff4d047..4fbb82d44 100644
--- a/src/main/java/fr/openmc/core/registry/regions/types/Region.java
+++ b/src/main/java/fr/openmc/core/registry/regions/types/Region.java
@@ -4,11 +4,18 @@
 import fr.openmc.core.registry.regions.CustomRegion;
 
 public abstract class Region extends CustomRegion {
+    private final BlockVector3 min;
+    private final BlockVector3 max;
+
+    public Region() {
+        this.max = getPos1().getMaximum(getPos2());
+        this.min = getPos1().getMinimum(getPos2());
+    }
     @Override
     public boolean contains(BlockVector3 pos) {
-        return pos.containedWithin(
-                getMin(),
-                getMax()
+       return pos.containedWithin(
+                min,
+                max
         );
     }
 }
\ No newline at end of file
diff --git a/src/main/java/fr/openmc/core/registry/regions/types/SphericalRegion.java b/src/main/java/fr/openmc/core/registry/regions/types/SphericalRegion.java
index 2a9a6a97c..cab10eea8 100644
--- a/src/main/java/fr/openmc/core/registry/regions/types/SphericalRegion.java
+++ b/src/main/java/fr/openmc/core/registry/regions/types/SphericalRegion.java
@@ -19,12 +19,12 @@ public boolean contains(BlockVector3 pos) {
     }
 
     @Override
-    public BlockVector3 getMin() {
+    public BlockVector3 getPos1() {
         return null;
     }
 
     @Override
-    public BlockVector3 getMax() {
+    public BlockVector3 getPos2() {
         return null;
     }
 }