Benzo who had arrived in Hokkaido on August 17, 1881, went on an investigation trip leaving Hakodate for Iburi, and once coming back to Hakodate, he left again for Nemuro to survey the coastal areas of Kushiro-no-kuni Province, Tokachi-no-kuni Province and Hidaka-no-kuni Province, thereafter coming back to the starting point via Tomakomai and Sapporo City.
明治14年（1881年）8月17日に北海道に渡った勉三は函館から胆振、函館に戻り根室に向かい釧路国・十勝国・日高国の沿岸部を調査し、苫小牧・札幌市を経て帰途につく。