O 15 Chwefror cyflwynodd Llywodraeth Cymru waharddiad ar deithwyr sy’n cyrraedd Cymru ar ôl bod mewn gwlad ar y rhestr goch yn y 10 diwrnod blaenorol. Mae’n rhaid i’r teithwyr hyn ddod i’r wlad drwy un o’r pyrth mynediad yn Lloegr (neu’r Alban) a chwblhau cyfnod cwarantin wedi’i reoli yno am 10 diwrnod cyn teithio ymlaen i Gymru. Golyga hyn na chaniateir mynediad i’r bobl hyn i Gymru (ar wahân i rai eithriadau cyfyngedig) a byddai gwneud hynny yn groes i’r ddarpariaeth hon yn drosedd gyda Hysbysiad Cosb Benodedig o £10,000.
From 15 February the Welsh Government introduced a ban on travellers arriving into Wales if they had been in a red list country in the previous 10 days.  They must arrive at one of the designated ports of entry in England (or Scotland) and remain there in managed isolation for 10 days before travelling on to Wales.  This means that such arrivals are not allowed entry in to Wales (except very limited exemptions) and to enter contrary to that provision will be a criminal offence with a Fixed Penalty Notice (FPN) of £10,000.