[AmigaBlizzard]

If you use streamer, you can use:
native STREAMER_TAG_AREA CreateDynamicRectangle(Float:minx, Float:miny, Float:maxx, Float:maxy, worldid = -1, interiorid = -1, playerid = -1);
and
forward OnPlayerEnterDynamicArea(playerid, STREAMER_TAG_AREA areaid);
forward OnPlayerLeaveDynamicArea(playerid, STREAMER_TAG_AREA areaid);

https://sampforum.blast.hk/showthread.php?tid=102865