Yoho National Park in British Columbia is often a side trip from nearby Banff National Park, at least it was for me. After my visit there, I know that the next time I visit the Canadian Rockies, Yoho will more than just a side trip. The main attraction in the park is Emerald Lake which is the largest of the 61 lakes that are contained within it's borders. The lake is surrounded by the mountains of the President Range, as well as Mount Burgess and Wapta Mountain. The lake derives it's name from the color of the water which is most vivid in the summer. Due to its high altitude, the lake is frozen from November until June.