Here is a free base version of the Underground River 30x40 battle map. You can get the version with grids here fro free:

https://www.patreon.com/posts/underground-free-110947478

This battle map has a total of 7 variations with and without grids (14 maps) and it's a part of the Mountain River map pack, which consists of five battle maps. The first map from the Mountain River map pack was released last week (Sinking River 30x40) and shows the area where the river sinks underground. This map is a direct continuation, showing the subterranean part of the river. The next three maps will be released over the next three weeks.

Next week, the map showing the spring of the river, Mountain River Spring 30x40, will be released.

If you want the map in 4K HD quality + all variations and 80 unique battle maps with more than 600 variations please visit my Battle Map Archive:

https://www.patreon.com/posts/cropox-archive-97244810

And please consider subscribing and supporting my work. Thanks!

Have a great game!