Terraforming Mars: Small Box expansion has a set of 3D terrain tiles to dress up the game. Included in the box are:
24 city tiles (four each of six designs)
40 forest tiles (eight each of five designs)
9 ocean tiles
14 special tiles (the original eleven, plus three new ones)
It also includes three new cards that relate to the three new special tiles, card dividers, and five plastic markers for the global parameters.
This is NOT the BIG Box which includes space for storing the full game and expansion.