Thanks for your questions!
The terrain and land will vary depending on the locations of the riverways – as I mentioned earlier in this thread the boat should be able to navigate a variety of waterways which, in turn, will have different terrains. Your design should be flexible and adaptable to the different circumstances.
As Dawul Wuru operate in Yirrganydji Country (roughly between Cairns and Port Douglas), you can research into the different land and terrain in this region and assume that there will likely be a variety of these encountered by the crocodile team.
For your second question, as mentioned Dawul Wuru operate on Yirrganydji Country – you can find more information about the area here.
I hope that helps!