The Boteti River runs through Maun and on into the Okavango Delta. On the other side of the Delta, the flows out consolidate from 3 prongs into one Okavango River. I expect that the water skiing was on the Boteti River and not the Okavango River.
In fact, I found this:
Meno A Kwena is an old-style safari camp, run by David Dugmore, an experienced guide with a real passion for Botswana's bush and for community development . It is situated on tribal land on a cliff edge overlooking the Boteti River, which began to flow again in late 2008, having been dry for over 15 years. The name Meno A Kwena is the local name for the area, which translates as 'teeth of the crocodile'.
Meno A Kwena's relaxed atmosphere, warm welcome and the team's keen interest in the surrounding area and its wildlife shine through – as does the hands-on approach of the camp's committed owner and managers. It won't be to everyone's liking – it's fairly rustic, and if you are travelling to Botswana for a pure big-game experience then it's tempting to say Meno A Kwena will not be for you. The return of water to the Boteti has started to change the dynamic here however and often game-viewing from the camp is as good as it is from the vehicle.
Looking at the bigger picture, Meno exists right on the transition zone between the unique Okavango Delta region of the Kalahari and the more typical, dryer regions further south - it's this location which makes it special. So, if you are keen to experience something slightly different from the norm with a rather quirky feel and an emphasis on the human side of life in Botswana as well as the wildlife, Meno is certainly worth a visit for at least a couple of nights.