ODA is short for the out-of-delivery area, and same as the delivery in a remote area, where is difficult to reach(e.g. islands, ski areas, military operation area etc). 

Additional shipping charges could occur and the transit time for shipments to these regions may be longer.

The carrier defines ODA delivery, delivery in remote area only before shipping. You may get reached by then asking for the additional charge.

For example,a business address in the city centre is recommended for deliveries in HongKong, as we are using SF Express for the delivery in HongKong. 

They would probably charge for an extra HKD16~20 for areas out of the city. 

If it happens, please contact us.