Sarasaland (not Sarasa Land) is a region of the Mushroom World; the place where Daisy comes from and rules over. Sarasaland is made up of 4 kingdoms: Muda, Easton, Birabuto, and Chai. It is said that Sarasaland is a neighboring kingdom of the Mushroom Kingdom. Sarasaland has only appeared in Super Mario Land, which was made a loonnngg time ago (for the Gameboy), so it doesn't look as great as other places you've seen.
Muda is the ocean-themed kingdom out of the four. Easton is actually a kingdom that is based off of Eastern Island. It even has the mysterious Moai statues visible throughout the level in Super Mario Land. Birabuto is a Egyptian themed kingdom. You see pyramids and even hieroglyph carvings in the cave levels when you play Super Mario Land. It's also the first level in the game. And last, but not least, the the China themed Chai. If I'm not mistaken, Chai is the last level you play in Super Mario Land before you face Tatanga.
Some people believe that Daisy's Circuit (Mario Kart Wii) took place in Sarasaland, but nothing has been confirmed about it's setting.