Gedamsa Caldera

{{Short description|A 7 x 9 km caldera in the Main Ethiopian Rift valley}}

{{Infobox mountain

| name = Gedamsa Caldera

| photo = File:Gedamsa_caldera.jpg

| photo_caption = the Gedamsa Caldera lies east of Lake Koka and SW of a Sugar farm

| elevation_m = 1984

| elevation_ref ={{cite gvp|vn=221230|name=Gedamsa Caldera|accessdate=2013-07-13}}

| prominence_m =

| prominence_ref=

| location = Ethiopian Rift Valley, {{flag|Ethiopia}}

| range =

| map = Ethiopia |relief=1 | region =

| map_caption =

| map_size = 225

| label_position = right

| coordinates = {{coord|8.350|N|39.180|E|type:mountain_scale:100000|format=dms|display=inline,title}}

| coordinates_ref =

| topo =

| type = Caldera

| age =

| last_eruption = Holocene

| first_ascent =

| easiest_route =

}}

The Gedamsa Caldera is a 7 x 9 km caldera in the Main Ethiopian Rift valley. The caldera has steep sides with {{convert|100|-|200|m|ft|0}} high walls, the upper parts of which consist predominantly of rhyolitic lava flows deposited in a series of trachite ignimbrite eruptions. There are small basaltic spatter cones and fumarolic activity inside the caldera floor along with a series of (Late Pleistocene to Holocene) rhyolite and pumice deposits and a Holocene lava dome/flow.