Uruma City Okinawa: Katsuren Castle, Hamahiga Island & Sea Road

Why Uruma City: A Quieter Side of Okinawa

Uruma City (うるま市) sits on Okinawa's central east coast, about 40 minutes north of Naha by car. It is not on most tourist itineraries, which is part of the appeal. While the resort coast and Naha draw the crowds, Uruma offers a UNESCO-listed castle, a 4.7 km bridge over turquoise shallows to offshore islands, and beaches where you may be the only visitor.

Two things define a Uruma visit: Katsuren Castle Ruins (勝連城跡), a medieval Ryukyuan gusuku (fortress) with panoramic views, and the Kaichu-doro Sea Road (海中道路), a dramatic bridge connecting the mainland to four small islands. Together, they make one of the most rewarding half-day drives on the main island. For the broader Okinawa experience, see our hub guide.

Katsuren Castle Ruins: UNESCO Gusuku Heritage

Katsuren Castle (勝連城跡) is a UNESCO World Heritage Site and one of Okinawa's nine listed gusuku (グスク) — the stone fortresses unique to the Ryukyu Kingdom. According to the Uruma City official site, the castle was built in the 15th century and was the stronghold of Lord Amawari, a powerful noble who challenged the Ryukyu king.

The ruins sit on a hillside with a commanding view of the east coast and the offshore islands. The stone walls follow the natural contours of the ridge — a distinctive Ryukyuan architectural technique that uses the landscape rather than fighting it. The climb to the top takes about 15-20 minutes on a paved path.

Admission is free. The grounds are open 24 hours. The adjacent exhibition hall operates 9:00-17:00, also free. Parking is free for approximately 100 cars. The castle is significantly less crowded than Shuri Castle in Naha, making it a more contemplative experience.

Kaichu-doro Sea Road and the Offshore Islands

Driving the 4.7 km Bridge

The Kaichu-doro (海中道路) is a 4.7 km causeway built over shallow turquoise waters, connecting the Katsuren Peninsula to four offshore islands: Henza, Miyagi, Ikei, and Hamahiga. According to Okinawa Story, the road is free to drive and open 24 hours.

The drive itself is the attraction — the road runs barely above sea level with water visible on both sides, and on clear days the color of the shallow ocean is almost unreal. Many visitors on TripAdvisor describe it as one of the most scenic drives on the main island.

Drive early morning for the best light and least traffic. The road is a popular weekend drive for locals, so weekday mornings are quieter.

Salt Factory and Beach Access Points

A rest stop and salt factory (Nuchimasu Salt Factory) sits partway along the bridge, offering locally produced sea salt products and ocean views. Several beaches are accessible from the offshore islands — less developed and significantly less crowded than the west coast resort beaches.

Hamahiga Island: Beaches and Sacred Sites

Hamahiga Island (浜比嘉島) is the most spiritually significant of the Kaichu-doro islands. In Okinawan mythology, Hamahiga is associated with the creation deities Amamikiyo and Shinerikyo — making it one of the most sacred sites in Ryukyuan folklore.

The island has small beaches, quiet fishing villages, and shrines scattered along the coast. The atmosphere is rural and unhurried — a contrast to the resort developments on Okinawa's west coast. The salt factory on the island produces traditional sea salt using Okinawan methods.

Hamahiga is connected by bridge (part of the Kaichu-doro network), so access by car is straightforward. The island is small enough to explore in 1-2 hours.

Getting to Uruma from Naha

By car (recommended): Approximately 40 minutes from Naha via the Okinawa Expressway. Free parking at Katsuren Castle and at rest stops along the Sea Road. A rental car is strongly recommended — the distances between sites and infrequent bus service make driving the practical option.

By bus: Ryukyu Bus Route 120 from Naha to the Uruma area takes approximately 1 hour and costs ¥1,200 (~$8) one way. Buses are infrequent — check the schedule and plan around return times.

A practical half-day itinerary: drive from Naha to Katsuren Castle (40 minutes), explore the ruins (1 hour), then drive the Sea Road to Hamahiga Island (30 minutes), spend 1-2 hours on the island, and return to Naha. Total: 4-5 hours.

Frequently Asked Questions

Can I visit Katsuren Castle and drive the Sea Road in one day from Naha?

Yes — comfortably as a half-day trip. Drive from Naha (40 minutes), visit Katsuren Castle (free, about 1 hour), then drive the Sea Road to Hamahiga Island (30 minutes). Budget 4-5 hours total. A car is strongly recommended.

Is Katsuren Castle free to enter?

Yes. The castle ruins and grounds are free and open 24 hours. The exhibition hall is open 9:00-17:00, also free. Free parking for approximately 100 cars.

Is Hamahiga Island worth visiting?

Yes — for quiet beaches, sacred shrines, and a rural Okinawa atmosphere away from tourist areas. The island holds deep significance in Okinawan mythology. Allow 1-2 hours for exploration. Connected by bridge — no ferry needed.

Do I need a car to visit Uruma City?

Strongly recommended. Buses from Naha reach Uruma in about 1 hour (¥1,200) but are infrequent. The Sea Road and offshore islands are impractical without a car or scooter.