Northeast India, often called the "Seven Sisters," is a truly frontier destination for motorbike touring, offering lush green mountains, tribal culture, and highly scenic, winding roads. For a 14-day tour, the best focus is the Arunachal Pradesh Circuit (Tawang), combined with the culture and wildlife of Assam, as this region offers the most diverse and spectacular riding challenges within the timeframe. Here is the best 15-day itinerary, starting and ending in Guwahati (Assam), the main entry point to the region. This route covers the plains of Assam, the steep mountains and high passes of Arunachal Pradesh, and the rich wildlife of the region. This itinerary offers a profound glimpse into the culture, challenge, and immense beauty of India's Northeast frontier.