The Treaty itself lays out specific responsibilities for the Keledoni and Sennish governments and sets clear borders between the two lands. The disputed territory of Southern Sen, a Keledoni holding, was claimed completely by Keledon; not an acre was ceded.
The root of the treaty was a strong Sennish fear that Keledon would invade and conquer the small principality--a course of action that was not likely considered by Gendar IV. Realistically, Gendar's motivation seemed to be to play on Sennish fears and thus earn specific concessions.
In the end the main points of the treaty were:
1) That Keledon would maintain sovereignty over Southern Sen and pledge to take no hostile actions against Sen itself.
2) Free and unrestricted passage through Southern Sen would be allowed for the Sennish, allowing them to maintain coastal access to trade routes.
3) Sen would undertake no military action against the Keledoni inhabitants of Southern Sen.