The phrase "regular terrain" is correct and can be used in written English
Example: The hiking trail was relatively easy to navigate due to the regular terrain, with smooth paths and gradual inclines.
Due to Ikata's length and mountainous terrain, regular bus service did not reach the tip of the peninsula until the 1960s.
The images on CNN were entrancing to a 9-year-old: nothing but desert and sky, armored vehicles rolling along flat terrain, the regular, pulse-like plume of smart bombs detonating through grates in the sides of buildings.
Guevara's guerrilla force, numbering about 50 men and operating as the ELN (Ejército de Liberación Nacional de Bolivia; "National Liberation Army of Bolivia"), was well equipped and scored a number of early successes against Bolivian army regulars in the difficult terrain of the mountainous Camiri region during the early months of 1967.
This is precisely the harsh terrain that TomDispatch regular Ira Chernus navigates today in "America's Reckless War Against Evil".
Candidates are expected to run or hike for hours (during the "Long Drag", for up to twenty) through tough terrain on a regular basis.
Mr. Elfstrom, who is also a biologist, offers lessons on regular roads as well as rugged terrains through his business, Overland Experts, (overlandexperts.com), in Hadlyme, a town in East Haddam.
By never doing business with scandal sheets or selling pictures his subjects considered unflattering, he told interviewers, he gained access to the terrain where celebrities exist as regular people.
SLOPEMAP is a suite of QUICKBASIC programs for the spatially distributed derivation of geometrical and kinematical properties of hill slopes in hard rock terrain with structural and topographic data, based on regular cellular grids.
The relative poverty of the kingdom, difficult terrain and the lack of a system of regular taxation, helped to limit the scale of central administration and government by the Scottish crown.
