diff --git a/include/region.h b/include/region.h
new file mode 100644
index 000000000..59dc5fcd6
--- /dev/null
+++ b/include/region.h
@@ -0,0 +1,46 @@
+/*	SCCS Id: @(#)region.h	3.3	96/06/17	*/
+/* Copyright (c) 1996 by Jean-Christophe Collet			  */
+/* NetHack may be freely redistributed.  See license for details. */
+
+#ifndef REGION_H
+#define REGION_H
+
+/* generic callback function */
+
+typedef boolean FDECL((*callback_proc), (genericptr_t, genericptr_t));
+
+typedef struct {
+  NhRect bounding_box;		/* Bounding box of the region */
+  NhRect *rects;		/* Rectangles composing the region */
+  short  nrects;		/* Number of rectangles  */
+  boolean attach_2_u;		/* Region attached to player ? */
+  unsigned int attach_2_m;	/* Region attached to monster ? */
+  /*struct obj *attach_2_o;*/	/* Region attached to object ? UNUSED YET */
+  const char* enter_msg;	/* Message when entering */
+  const char* leave_msg;	/* Message when leaving */
+  short  ttl;			/* Time to live. -1 is forever */
+  short expire_f;		/* Function to call when region's ttl expire */
+  short can_enter_f;		/* Function to call to check wether the player
+				   can, or can not, enter the region */
+  short enter_f;		/* Function to call when the player enters*/
+  short can_leave_f;		/* Function to call to check wether the player
+				   can, or can not, leave the region */
+  short leave_f;		/* Function to call when the player leaves */
+  short inside_f;		/* Function to call every turn if player's
+				   inside */
+  boolean player_inside;	/* Is the player inside this region */
+  unsigned int* monsters;	/* Monsters currently inside this region */
+  short n_monst;		/* Number of monsters inside this region */
+  short max_monst;		/* Maximum number of monsters that can be
+				   listed without having to grow the array */
+#define MONST_INC	5
+
+  /* Should probably do the same thing about objects */
+
+  boolean visible;		/* Is the region visible ? */
+  int glyph;			/* Which glyph to use if visible */
+  genericptr_t arg;		/* Optional user argument (Ex: strength of
+				   force field, damage of a fire zone, ...*/
+} NhRegion;
+
+#endif /* REGION_H */