31. Sometime around 400 BCE, Celtic tribes crossed the Alps from Gaul and settled the Po river plain . 32. They distinguished themselves during Eastern Front being tasked to hold the front in the Don river plains . 33. Downriver in a river plain area known as Oderbruch, some 19, 000 residents were threatened with evacuation. 34. It starts in the Rocky Mountains and flows in a generally southeast direction into the Snake River Plain . 35. The early Harappan cultures were preceded by local Neolithic agricultural villages, from where the river plains were populated. 36. The unique dip of the Teton fault can be explained by the subsidence of the Snake River Plain . 37. Together these eruptions have helped create the eastern part of the Snake River Plain from a once-mountainous region. 38. The summit offers a sweeping view of the vast Snake River Plain to the east, south, and west. 39. Island Park Reservoir, a component of the Minidoka Project, is used for irrigation in the Snake River Plain . 40. Over thousands of millennia, the rich river plain with sandy channels, swamps and lush lowland forest dried up.
