Hi, Vinay! You can either take a bus from Tawang to Naharlagun, and from Naharlagun you can get a shared cab to Ziro. However, taking a direct taxi from Tawang to Ziro would be more comfortable and time-saving option. There are no night bus services from Tawang to Ziro or Tezpur.
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Take bus to Naharlagun.. then to Ziro valley