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diff --git a/src/common/mmaps_common/MMapDefines.h b/src/common/mmaps_common/MMapDefines.h
new file mode 100644
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+++ b/src/common/mmaps_common/MMapDefines.h
@@ -0,0 +1,97 @@
+/*
+ * This file is part of the TrinityCore Project. See AUTHORS file for Copyright information
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef MMapDefines_h__
+#define MMapDefines_h__
+
+#include "Define.h"
+#include <DetourNavMesh.h>
+
+inline uint32 constexpr MMAP_MAGIC = 0x4d4d4150; // 'MMAP'
+inline uint32 constexpr MMAP_VERSION = 16;
+
+struct MmapNavMeshHeader
+{
+    uint32 mmapMagic = MMAP_MAGIC;
+    uint32 mmapVersion = MMAP_VERSION;
+    dtNavMeshParams params = { };
+    uint32 offmeshConnectionCount = 0;
+};
+
+static_assert(sizeof(MmapNavMeshHeader) == 40);
+
+struct MmapTileHeader
+{
+    uint32 mmapMagic = MMAP_MAGIC;
+    uint32 dtVersion = DT_NAVMESH_VERSION;
+    uint32 mmapVersion = MMAP_VERSION;
+    uint32 size = 0;
+    char usesLiquids = true;
+    char padding[3] = { };
+};
+
+// All padding fields must be handled and initialized to ensure mmaps_generator will produce binary-identical *.mmtile files
+static_assert(sizeof(MmapTileHeader) == 20, "MmapTileHeader size is not correct, adjust the padding field size");
+static_assert(sizeof(MmapTileHeader) == sizeof(MmapTileHeader::mmapMagic) +
+                                        sizeof(MmapTileHeader::dtVersion) +
+                                        sizeof(MmapTileHeader::mmapVersion) +
+                                        sizeof(MmapTileHeader::size) +
+                                        sizeof(MmapTileHeader::usesLiquids) +
+                                        sizeof(MmapTileHeader::padding), "MmapTileHeader has uninitialized padding fields");
+
+enum NavArea
+{
+    NAV_AREA_EMPTY          = 0,
+    // areas 1-60 will be used for destructible areas (currently skipped in vmaps, WMO with flag 1)
+    // ground is the highest value to make recast choose ground over water when merging surfaces very close to each other (shallow water would be walkable)
+    NAV_AREA_GROUND         = 11,
+    NAV_AREA_GROUND_STEEP   = 10,
+    NAV_AREA_WATER          = 9,
+    NAV_AREA_MAGMA_SLIME    = 8, // don't need to differentiate between them
+    NAV_AREA_MAX_VALUE      = NAV_AREA_GROUND,
+    NAV_AREA_MIN_VALUE      = NAV_AREA_MAGMA_SLIME,
+    NAV_AREA_ALL_MASK       = 0x3F // max allowed value
+};
+
+enum NavTerrainFlag : uint16
+{
+    NAV_EMPTY        = 0x00,
+    NAV_GROUND       = 1 << (NAV_AREA_MAX_VALUE - NAV_AREA_GROUND),
+    NAV_GROUND_STEEP = 1 << (NAV_AREA_MAX_VALUE - NAV_AREA_GROUND_STEEP),
+    NAV_WATER        = 1 << (NAV_AREA_MAX_VALUE - NAV_AREA_WATER),
+    NAV_MAGMA_SLIME  = 1 << (NAV_AREA_MAX_VALUE - NAV_AREA_MAGMA_SLIME)
+};
+
+enum OffMeshConnectionFlag : uint8
+{
+    OFFMESH_CONNECTION_FLAG_BIDIRECTIONAL   = 0x01
+};
+
+struct OffMeshData
+{
+    uint32 MapId;
+    uint32 TileX;
+    uint32 TileY;
+    float From[3];
+    float To[3];
+    float Radius;
+    OffMeshConnectionFlag ConnectionFlags;
+    uint8 AreaId;
+    NavTerrainFlag Flags;
+};
+
+#endif // MMapDefines_h__