Hi

I am having an issue trying to figure out how to get my internal interfaces to see each other. I have four Mikrotik RouterBoards 750GL, They are configured as follows.

10.0.0.1 - External A
192.168.1.3 - External B
192.168.1.101 - External C
192.168.1.134 - External C

I have an Web Application Server running on the 192.168.1.X network. and would like to configure Routing such that machines on the 10.X.X.X network can access it. What do I do?

Not enough info here. How are these routers connected to each other?

If the routers all share the 10.0.0.x network, and all have a 192.168.1.x localnet, it will be very difficult to route all those. Maybe one 192.168.1.x network will work.