I am looking for maps for Heroes III.

The map is quite large, possibly the maximum size, and was played in a 3x3 format: Castle/Rampart/Tower versus Inferno/Necropolis/Dungeon. Each player started with 3 cities, and there were pillars with each player's color between them to open the passage. The Grail was hidden in the Dungeon; you had to sail to it on a boat, and it was located on a small island. I'll attach a sketch of the upper part of the world; I don't remember what the Dungeon looked like.
Part 1
Part 2
Minimap