Praseodymium doped lanthanum metaborate, La(BO2)(3), is synthesized by solution chemistry. The title compound crystallizes in the monoclinic space group I2/c. The ten-fold coordinated rare earth ion is located in the C-2 low point symmetry site. The optical and crystal field analyses of P-r3+ in this host lattice are presented. The absorption spectra are recorded from the visible to the far IR domain at 300 and 9 K. The low temperature absorption spectra show only one electronic line for H-3(4) --> P-3(0) transition confirming a unique local environment for the rare earth ion in this metaborate phase. Under various Ar+ laser excitations, the emission of Pr3+ ion is detected from the P-3(0) and D-1(2) excited levels of the 4f(2) ground configuration. A selective excitation in the D-1(2) level was also performed. The electrostatic crystal field (cf) effect on the 4f(2) configuration has been evaluated on the basis of the cf theory with nine phenomenological B-q(k) crystal field parameters (cfp) in the C-2v point symmetry, using 54 (52) experimental cf levels deduced from the absorption and emission spectra. The final simulation is achieved with an r.m.s. of 16.1 (12.6)cm(-1).