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We present a new large-scale (4 square degrees) simultaneous $^{12}$CO,$^{13}$CO, and C$^{18}$O ($J$=1$-$0) mapping of L1188 with the PMO 13.7-mtelescope. Our observations have revealed that L1188 consists of two nearlyorthogonal filamentary molecular clouds at two clearly separated velocities.Toward the intersection showing large velocity spreads, we find severalbridging features connecting the two clouds in velocity, and an open arcstructure which exhibits high excitation temperatures, enhanced $^{12}$CO and$^{13}$CO emission, and broad $^{12}$CO line wings. This agrees with thescenario that the two clouds are colliding with each other. The distribution ofyoung stellar object (YSO) candidates implies an enhancement of star formationin the intersection of the two clouds. We suggest that a cloud-cloud collisionhappened in L1188 about 1~Myr ago, possibly triggering the formation of low-and intermediate-mass YSOs in the intersection.

L1188: a promising candidate of cloud-cloud collision triggering the formation of the low- and intermediate-mass stars