The grove was planted during the early 17th century by the first lord of the Karatsu Domain, Terasawa Hirotaka, to protect crops from salt damage.
It is officially recognized as one of the '100 Best Pine Forests in Japan' and a '100 Best White Sand and Blue Pine Beaches' site.
The soil consists primarily of sand, which has required the trees to develop deep, complex root systems over centuries.
The forest covers an area of approximately 360 hectares.
The Karatsu specialty food known as 'Matsubara Okoshi' (a ginger-flavored rice cracker) is named after the grove.
Niji No Matsubara is a sprawling 5-kilometer-long coastal pine grove located in Karatsu, Saga Prefecture, Japan. It features approximately one million black pine trees planted along the sandy shore of Karatsu Bay, forming a natural barrier against wind and salt spray. The site is designated as one of Japan's Three Great Pine Groves and holds a Special Place of Scenic Beauty designation. A paved road runs directly through the forest, allowing visitors to drive or cycle beneath the dense canopy. The area transitions directly into the white sand of Niji-no-Matsubara Beach, which is popular for walking and seasonal ocean activities. The grove's name translates to 'Rainbow Pine Grove,' referring to the arc-shaped coastline it follows.
The elevated observation deck at Kagami-yama offers a panoramic view looking down upon the entire arc of the pine grove.
Wear sturdy walking shoes to navigate the soft, uneven sandy ground off the paved paths.
Bring mosquito repellent during the summer and early autumn months when insects are active in the dense shade.
Follow the designated trails to prevent damaging the delicate forest floor ecosystem.
Do not attempt to drive off the paved forest road onto the sand, as vehicle tires easily sink into the deep beach soil.
Take all trash with you; littering is strictly prohibited in this protected environmental site.
