Oka Castle Ruins

Castle
Prefecture
Oita
Type
Castle
N/A
0 reviews
¥300
Entry Fee
Train Access

About This Destination

Dramatic hilltop castle ruins that inspired the beloved song Kojo no Tsuki, offering spectacular views and atmospheric stone walls.
Mountaintop castle ruin in Taketa that inspired Taki Rentaro's song Kojo no Tsuki (Moon Over the Ruined Castle). Built 1185 on a steep cliff above the Inaba and Ono Rivers—never conquered despite multiple sieges including by the Shimazu. Stone walls wind along a narrow ridge for over a kilometer; you can see valleys and mountains in all directions. Autumn is best when red leaves contrast with grey stone and morning mist fills the valley. The entrance hands out a hand-drawn scroll map.

Location

Prefecture: Oita

Address: Taketa, Oita, Japan

Nearest Station: Bungo-Taketa Station

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Visitor Information

Credit Cards: Unknown

Food Options: No on-site dining. Taketa town has several restaurants serving kabosu citrus-flavored dishes and local chicken.

Access

Oita, Japan

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Frequently Asked Questions

How do I get to Oka Castle Ruins?

From Oita Station, take the JR Hohi Line limited express to Bungo-Taketa Station (about 1 hour 10 minutes, 2,210 yen) — the line passes through the dramatic Aso volcanic landscapes. From Bungo-Taketa Station, walk 25 minutes east or take a 5-minute taxi to the castle entrance. By car, about 1 hour from Oita City via Route 57. Free parking on-site. Allow 1.5–2 hours for the climb and exploration.

What's the connection to Kojo no Tsuki song?

Composer Taki Rentaro spent his childhood in Taketa town and was inspired by Oka Castle's atmospheric ruins to compose 'Kojo no Tsuki' (Moon Over the Ruined Castle) in 1901 — the melody became one of Japan's most beloved songs and was even adopted by the heavy metal band Scorpions. A monument and museum dedicated to Taki are at the foot of the castle hill, and the melody plays automatically at the train station. The lyrics evoke a moonlit night at the abandoned castle, melancholy and timeless.

When is the best time to visit Oka Castle Ruins?

Mid-November for autumn foliage when the maples around the stone walls turn brilliant red and gold — Oka Castle is one of Kyushu's top foliage castle sites. Spring (April for cherry blossoms) is also lovely. Early morning is magical when mist fills the valley below — locals call this 'Sea of Clouds Castle.' Avoid summer humidity and rainy season (June). Wear comfortable shoes; the steep stone paths can be slippery. The hand-drawn scroll map at the entrance is a souvenir worth keeping.

What's the entry fee and what's included?

Adult admission is 300 yen, junior-high and elementary 150 yen. The fee includes the entire castle ruins (free walking, no time limit), the hand-drawn scroll-style map at the entrance, and access to the small Taki Rentaro Memorial Museum at the foot of the hill. Cash only. Open daily 9 AM to 5 PM (last entry 4:30 PM); the grounds technically remain accessible after hours but the entrance booth and map distribution close. Allow 1.5–2 hours.

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