According to local folklore, Kamrunag was a serpent deity who meditated at this lake and blessed the region with prosperity. The lake temple, built centuries ago, has a fascinating tradition – devotees offer gold and silver ornaments to the deity, which are then thrown into the lake. Legends say the lake's depth is immeasurable and connects to underground passages. During the annual Kamdru Nag Fair in June, thousands of villagers from surrounding areas trek to the lake carrying their local deities, creating a vibrant cultural spectacle.

The trek to Kamdru Nag typically starts from Rohanda village, accessible from Mandi. The 15-kilometer trail is graded as moderate to difficult, taking 2-3 days to complete with overnight camping. The path winds through dense oak and rhododendron forests, crosses several streams, and traverses steep sections requiring good stamina. The final ascent to the lake is particularly challenging with loose rocks and steep inclines. Altitude gain is significant, so proper acclimatization is essential.

The trek offers incredible biodiversity. Spring brings blooming rhododendrons painting the hillsides in vibrant colors. The forests are home to Himalayan birds, langurs, and if you're lucky, you might spot a Himalayan black bear or musk deer. As you ascend, the landscape transitions from dense forests to alpine meadows dotted with wildflowers. The lake itself, surrounded by towering peaks and often partially frozen even in summer, presents a dramatic and serene setting.

The ideal trekking season is May to June and September to October. May-June offers pleasant weather and blooming flora, though some snow may still be present near the lake. September-October provides crystal-clear post-monsoon views and comfortable temperatures. The annual fair in June attracts large crowds, offering a unique cultural experience but less solitude. Winter (November-April) makes the trek extremely difficult and dangerous due to heavy snowfall and should only be attempted by expert winter trekkers.

This trek requires serious preparation. Build your fitness with cardiovascular training and practice hikes at least 6-8 weeks in advance. Essential gear includes good trekking shoes, warm layers (temperatures can drop below freezing at night), rain protection, camping equipment, and sufficient food supplies. Hiring a local guide is highly recommended as trails can be confusing. Carry a basic first-aid kit including altitude sickness medication. Inform someone about your trek plans and expected return date.