Ranu Kumbolo – Hidden Lake on the Semeru Trek

Overview

Nestled along the trekking route to Mount Semeru’s Mahameru Peak (3,676 m, the highest point in Java), Ranu Kumbolo is a breathtaking 18‑hectare lake surrounded by valleys and forested hills. Its crystal‑clear waters and serene atmosphere make it one of the most enchanting spots in East Java.

For climbers, Ranu Kumbolo is more than just a resting point — it’s a natural haven where tents are pitched, meals are shared, and the sunrise over the lake creates unforgettable memories. The scenery here is both calming and inspiring, offering a perfect pause before continuing the ascent to Semeru’s summit.

How to Get There

The journey begins at Ranu Pani, the last village before the Semeru climb and the first official trekking post. To reach Ranu Pani:

Via Malang: Rent a jeep (hardtop) from Tumpang Village and drive to Ranu Pani.
Via Probolinggo: From villages near Mount Bromo, jeeps are available to Ranu Pani.
Via Lumajang: Public transportation can take you to Ranu Pani.

From Ranu Pani, the trek to Ranu Kumbolo takes 3–5 hours on foot, depending on physical fitness. The trail is scenic but requires stamina, making the lake a rewarding destination for hikers.

Climate and Best Season

Because of its valley location, Ranu Kumbolo experiences extreme temperatures:

Dry Season (April–October): Best time to visit. Temperatures can drop below 0°C at night, so warm clothing is essential.
Rainy Season (November–March): Trails become muddy and slippery, making trekking more challenging.

Who Can Visit

Ranu Kumbolo is not only for seasoned climbers. In recent years, families and casual travelers have also camped here, enjoying a unique holiday experience in nature. The lake offers a chance to disconnect from city life and embrace the outdoors, provided visitors respect the environment and keep it sustainable.

What to Bring

Since there are no shops at Ranu Kumbolo, visitors must bring their own supplies:

Tent and camping gear
Warm clothes, jackets, gloves, beanie, and sleeping bags
Cooking equipment and food supplies
Sturdy trekking shoes and flashlights

Entrance Fee Information for Ranu Kumbolo (2025):

Local Tourists (Domestic Visitors):
- Weekdays: Rp 20,000 per person
- Weekends/Public Holidays: Rp 30,000 per person
International Tourists (Foreign Visitors):
- Weekdays: Rp 200,000 per person
- Weekends/Public Holidays: Rp 300,000 per person
Additional Fees (applies to all visitors):
- Hiking Permit: Rp 20,000
- Camping Fee: Rp 5,000 per person per night
- Insurance: Rp 4,000 per person per day