For example, Telok Ayer and Amoy Street are where the Hokkien congregate; the Teochew have settled by the Singapore River; the Cantonese live in Chinatown; the Hakka live on Upper Cross Street.
If we carefully examine the differences between Min Nan and Min Dong and Min Bei, we can see that some of the similarities between Min Nan and Hakka are exactly the main content of this kind of differences.