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The streets of Hokkaido are very wide.
Literal
Hokkaido [of-の] streets [topic-は] very wide.
街路 ('street, avenue') is a more formal, written word than 道 ('road, way') — implying a designed urban street rather than any old path. Synonyms like 道路 ('roadway') sit in between. Cultural note: Hokkaido cities, especially Sapporo, are famous for their American-style grid layout and wide avenues — the result of late-19th-century planning that drew on advisors from the United States — and contrast sharply with the narrow winding streets of older Honshu cities like Kyoto.