diff --git a/src/rendering/rendering.pro b/src/rendering/rendering.pro
index 3b43e57..a9ad638 100644
--- a/src/rendering/rendering.pro
+++ b/src/rendering/rendering.pro
@@ -16,7 +16,6 @@ linux-clang {
 DEFINES += HAVE_GLIB=1
 
 SOURCES += main.c \
-    zone.c \
     tools.c \
     system.c \
     scenery.c \
@@ -54,6 +53,7 @@ SOURCES += main.c \
     textures/tex_preview.c \
     textures/tex_presets.c \
     textures/tex_definition.c \
+    tools/zone.c \
     tools/texture.c \
     tools/parallel.c \
     tools/pack.c \
@@ -73,7 +73,6 @@ SOURCES += main.c \
     water/wat_definition.c
 
 HEADERS += \
-    zone.h \
     tools.h \
     system.h \
     scenery.h \
@@ -103,6 +102,7 @@ HEADERS += \
     textures/tex_preview.h \
     textures/public.h \
     textures/private.h \
+    tools/zone.h \
     tools/texture.h \
     tools/parallel.h \
     tools/pack.h \
diff --git a/src/rendering/textures/public.h b/src/rendering/textures/public.h
index e8b6955..f4e08bc 100644
--- a/src/rendering/textures/public.h
+++ b/src/rendering/textures/public.h
@@ -1,10 +1,10 @@
 #ifndef _PAYSAGES_TEXTURES_PUBLIC_H_
 #define _PAYSAGES_TEXTURES_PUBLIC_H_
 
-#include "../layers.h"
-#include "../zone.h"
-#include "../tools/lighting.h"
-#include "../terrain/public.h"
+#include "rendering/layers.h"
+#include "rendering/tools/zone.h"
+#include "rendering/tools/lighting.h"
+#include "rendering/terrain/public.h"
 
 #ifdef __cplusplus
 extern "C" {
diff --git a/src/rendering/zone.c b/src/rendering/tools/zone.c
similarity index 100%
rename from src/rendering/zone.c
rename to src/rendering/tools/zone.c
diff --git a/src/rendering/zone.h b/src/rendering/tools/zone.h
similarity index 83%
rename from src/rendering/zone.h
rename to src/rendering/tools/zone.h
index d65d4c0..1715ad4 100644
--- a/src/rendering/zone.h
+++ b/src/rendering/tools/zone.h
@@ -1,9 +1,13 @@
-#ifndef _PAYSAGES_ZONE_H_
-#define _PAYSAGES_ZONE_H_
+#ifndef _RENDERING_TOOLS_ZONE_H_
+#define _RENDERING_TOOLS_ZONE_H_
 
-#include "tools/euclid.h"
-#include "tools/curve.h"
-#include "tools/pack.h"
+/**
+ * Definition of a geographic area.
+ */
+
+#include "rendering/tools/euclid.h"
+#include "rendering/tools/curve.h"
+#include "rendering/tools/pack.h"
 
 #ifdef __cplusplus
 extern "C" {