Rainbow Hills Country Club's North-East Course occupies coastal terrain in Choshi, at the eastern tip of the Chiba Peninsula where the Tone River meets the Pacific Ocean. The course was designed by Izumi Ikkai and Izumi Michio, father and son architects who have contributed to several Japanese golf facilities. The Izumi family's design work typically emphasizes integration with natural landforms and attention to strategic shot values within the constraints of available property. The North-East routing takes advantage of the region's rolling topography, with holes that move through varied elevation changes characteristic of this part of Chiba Prefecture. The coastal location brings wind into play as a regular factor, particularly on exposed holes where players must account for prevailing breezes off the Pacific. The design incorporates traditional Japanese course features including carefully maintained bunkering and green complexes that reward precision over distance. Rainbow Hills operates as a members' club serving the Choshi area and golfers from the broader Kanto region. The facility includes multiple courses, with the North-East representing one routing within the larger property. Choshi's position as a fishing port and its relative distance from Tokyo gives the club a more regional character compared to courses closer to the capital. The layout provides a test suited to the climate and conditions of Japan's Pacific coast, where firm turf and wind create playing conditions distinct from inland courses in the prefecture.