Forests provide an abundance of <l:6,90>food<e> and <l:6,93>production<e> for a <l:6,104>city<e> without the need of any <l:6,63>tile improvements<e>, and a defensive bonus in combat. <l:8,19>Roads<e> are costly to build through the thick forest. <l:6,25>Rivers<e> greatly enhance this terrain. Forest tiles are an ideal terrain to <l:6,48>settle<e> on.