Tokushima Prefecture (徳島県, Tokushima-ken) is a prefecture of Japan located on Shikoku Island. The capital is the city of Tokushima. The Sanuki Mountains run along the northern border of the prefecture. As of 1 April 2012, 9% of the total land area of the prefecture was designated as Natural Parks, namely the Setonaikai National Park; Muroto-Anan Kaigan and Tsurugisan Quasi-National Parks; and Chūbu Sankei, Dochū-Kōtsu, Hashikura, Higashi Sankei, Okumiyagawa-Uchidani, and Ōasayama Prefectural Natural Parks. Tokushima depends on agriculture, forestry and fisheries. The percentage of agricultural workers and productivity is the second largest in Shikoku next to Kochi. Rice fields occupy the lower region of the Yoshino River and the small, narrow plains along the shore. Much of the remaining land is used for vegetables and flowers. The prefecture is the nation's largest supplier of cauliflower and lotus roots, and the fourth-largest producer of carrots. Japanese indigo is only produced here. Northern Tokushima's growth was accelerated by the completion of the Akashi Channel Bridge, which completes the road connection from Tokushima to Kobe. Industrial development continues around the Tokushima and Naruto districts. In particular, Itano District's Aizumi Town and Kitajima Town have experienced rapid growth, which has led to a proposed merger of the towns of Itano District into Itano City in the future.