Nakhon Ratchasima, usually referred to as Korat, is the largest city in the Isaan region of Thailand. Its proximity to Bangkok and Issan make it a good stopping-off point for travellers who are heading into Issan. It has excellent transport links to the rest of the country and beyond. And there are buses which run to just about every city in the northern, northeastern and eastern regions. You can even get buses to Vientiane in Laos and to the Cambodian border at Aranyaprathet.
Despite the size of the city, it is not a favoured holiday destination for the average foreign traveller. Instead, visitors are more likely to base themselves in the city as they visit nearby tourist destinations such as Khao Yai national park, Phimai and Phanom Rung.
(http://wikitravel.org/en/Korat)