Wallula Gap () is a large water gap of the Columbia River through the Horse Heaven Hills basalt anticlines in the Columbia River Basin in the U.S. state of Washington, just south of the confluence of the Walla Walla and Columbia rivers. It has been recognized as a National Natural Landmark by the National Park Service as a site that provides an important illustration of the geological history of the United States.
In southeastern Washington, eastern Oregon, and southern Idaho, flood basalt flows of extremely fluid basaltic lava spread in all directions from long fissures, building broad fields of gently sloping lava that spread widely over great distances. Along the Snake River in Idaho, and the Columbia River in Washington and Oregon, these lava flows have been extensively exposed by erosion , and measure almost 2 km in total thickness.
Source: Wikipedia.org
Copyright: Creative Commons 3.0
Select one of the most popular activities below or refine your search.
Discover the most beautiful and popular trails in the area, carefully bundled into appropriate selections.
Source: Williamborg
Copyright: Public domain
Select one of the most popular categories below or be inspired by our selections.
Discover the most beautiful and popular attractions in the area, carefully bundled in appropriate selections.
Source: Williamborg
Copyright: Public domain
With RouteYou, it's easy to create your own customised maps. Simply plot your route, add waypoints or nodes, add places of interest and places to eat and drink, and then easily share it with your family and friends.
Route planner
<iframe src="https://plugin.routeyou.com/poiviewer/free/?language=en&params.poi.id=7646093" width="100%" height="600" frameborder="0" allowfullscreen></iframe>
More than 11,800,000 routes
More than 15,000,000 users
More than 4,500,000 points of interest
Kerkstraat 108
9050 Gentbrugge, Belgium
© 2006-2026 RouteYou - www.routeyou.com
| | Public | 
