I don't think I really had a particular culture in mind when I designed the Hanarth. Though their 'marriage' ideas were based off of the 'walking marriages' of the Mosuo people of Southwestern China.

And as for the Deepwood, it looks to me like it's a bit large, especially for only holding 650,000 people in it. Oh, and I'm not overly fond of people saying that their entire race is beautiful. But I do like the nation overall; I was actually thinking of making a nation quite similar to it at one point. But I went with Hanartha instead.