Much of the natural habitat in the low-lying areas of western Georgia has disappeared during the past 100 years because of the agricultural development of the land and urbanization. The large majority of the forests that covered the Colchis plain are now virtually non-existent with the exception of the regions that are included in the national parks and reserves (e.g. Lake Paliastomi area). At present, the forest cover generally remains outside of the low-lying areas and is mainly located along the foothills and the mountains. Western Georgia's forests consist mainly of deciduous trees below  above sea level and contain species such as oak, hornbeam, beech, elm, ash, and chestnut. Evergreen species such as box may also be found in many areas. Ca. 1000 of all 4000 higher plants of Georgia are endemic to this country.