Willow Flats Sump Camping Area is located in the Malheur National Wildlife Refuge in southeastern Oregon. The campground is situated alongside the Donner and Blitzen River and offers stunning views of the surrounding mountains and wetlands. The area is home to a diverse range of wildlife, including deer, coyotes, and a variety of bird species. One of the nearby points of interest is the historic Diamond Craters, a series of volcanic craters that can be explored by visitors.

The campground has ten first-come-first-served campsites available and offers several amenities, including fire rings, picnic tables, and vault toilets. There is no drinking water available on-site, so visitors are advised to bring their own.

An interesting fact about the area is that the Malheur National Wildlife Refuge is one of the largest wetland ecosystems in the state of Oregon, covering over 187,000 acres. It is also a popular spot for birdwatching, with over 300 species of birds recorded in the area.

The best time of year to visit Willow Flats Sump Camping Area is during the summer months when temperatures average around 80°F during the day and drop to around 40°F at night. However, visitors should be aware that the area can be prone to thunderstorms during the summer months.