The Cedar Avenue of Nikkō stretches for about 35 kilometres along the approaches to the shrine town, making it the world's longest tree-lined avenue — a record recognised in the Guinness Book of Records. The cedars, planted in the early 17th century, are enormous: trunks one to two metres in diameter, canopies meeting overhead. Walking or cycling under them, with shafts of light coming through the high branches, is one of the quieter and more atmospheric experiences in the Nikkō area.
The main section runs from Imaichi in the south to the shrine precinct. Parts of it can be walked as part of the old Nikkō Kaido road approach, passing through farmland and small settlements. The cedars are at their most impressive in morning mist or light rain.