Explore details about location Route 399. Route 399 is a location situated within the いわき市 alongside other areas such as 湯の岳別所線, 折木筒木原久ノ浜線, 釜戸小名浜線. Additionally, some smaller parts of Route 399 include specific areas like 小野四倉線, 常磐自動車道 (Joban Expressway) adding to the diversity of its landscape.