Mungyeongsaejae is highest and toughest hill to hike on the Yeongnamdaero, which connects the Han River and Nakdong River area over Joryeong Mountain on the Bekdudaegan range. It has long been regarded an important region for social, cultural, and economic distribution as well as a strategic military location. Saejae means the hill is so high, even birds find it difficult to overcome. Ancient texts also refer to it as a grassy (eoksae), forested hill, hence Saejae. Also it is situated between Haneuljae and Iwoorijae, thus earning it another name, Saejae (the hill in between), or the new hill.
After the Imjin (1592) Japanese invasion, Mungyeongsaejae was designated as a military stronghold with three gateways - Juhulgwan, Jogokgwan, and Joryeonggwan (historical site No. 147).
Mungyeongsaejae has splendid scenic views and is famous for its historical heritage and folk tales and songs. Historical remains such as Wonteo (sites of vagabond accommodations) and Gyogwijeongteo (a site where antecedent Gyeongsang provincial governors transferred their administrative stamps to their replacements), restored in 1999, are located here. Also found here is a Sanbuldyosim relic, a fire caution sign made of stone (cultural heritage material No. 226). The entire area is the historical site of the Imjin Japanese invasion, General Sinrip, the historical legends of the Donghak sect and patriotic militia, as well as various historical folk tales. Accordingly the region was designated as a local monument (No. 18) in 1974 and protected as a provincial park in 1981, making it an increasingly popular tourist destination.