The timberline is an important geographical feature that marks the point at which the trees stop growing due to the harsher climate conditions found at higher elevations. Synonyms for the timberline include the tree line, treeline, and timberline zone. This boundary is important for hikers and mountaineers to take note of as it can mark the transition from forested areas to alpine zones with more exposed, rocky terrain. The timberline can also have ecological significance as certain plant and animal species are adapted to living within this boundary, and changes to the timberline could have adverse effects on these species.