Welcome to Odori Park, known in Japanese as 大通公園, a long ribbon of green running through the heart of Sapporo, on the island of Hokkaido. The name simply means large street, and that is a fair clue to how it began. The park stretches east to west for about 1.5 kilometers, from the first block west of its starting point to the twelfth block west, and it covers 78,901 square meters. As you walk it, you are standing on a dividing line. To the north lie government offices and business towers. To the south lie department stores, shopping streets and restaurants, with the entertainment district of Susukino beyond. In the next few minutes we will look at why this strip exists, how a student-built snow display grew into a world-famous festival, what grows here, and which landmarks to look out for. Let's start by picturing Sapporo before the park was here.