You need to make sure that the edge on each side of your texture is the same color. It must be the exact rgb value, otherwise it'll look like there is a seem on the land.
Check out Van Seam(free), or AutoSeam($50) if you want a program to get rid of the seems for you. Texture maker($40?) also will do the job if you have that.
First I just suggust making sure the whole edge is the same color value before trying out these progams though.
Good luck!
A book? I hate book. Book is stupid.
(Formerly known as Yellow)
