*Catalan is the official language of Andorra, and a co-official language in the Spanish autonomous communities of Catalonia, the Balearic Islands and Valencian Community, also in the city of Alghero on the Italian island of Sardinia. It is also spoken, with no official recognition, in the autonomous communities of Aragon (in La Franja) and Murcia (in Carche) in Spain, and in the historic Roussillon region of southern France, roughly equivalent to the current département of the Pyrénées-Orientales (Northern Catalonia).

There are two standard dialects, one based on Eastern Catalan and one based on Valencian.

Carbonell, Joan F.; Llisterri, Joaquim (1999), "Catalan", Handbook of the International Phonetic Association: A Guide to the usage of the International Phonetic Alphabet, Cambridge: Cambridge University Press, pp. 61–65, ISBN 0-521-63751-1

Positional information and geminates after discussion JK with MRL and CPM.
Note that there are two diphthongs /ju/ and /iw/ which "hidden" behind the representation /iu/, since UPSID uses only vowel symbols in diphthongs and does not show which of the two vowels is nuclear. (This is always the closest vowel, but in the case of /iu/ both vowel parts are equally close.
Likewise the two dipthongs /wi/ and /uj/ are "hidden" behind the representation /ui/.
This is clearly a shortcoming of L1-L2map and UPSID.