Computer-aided visualization provides meaningful insight into geography teaching, which helps improve comprehension. With dynamic geometry software (DGS), a teacher can easily create interactive mathematical learning materials. To fully benefit from DGS applied to subjects other than mathematics, their functionality must be extended with features which are inherent to those subjects. We demonstrate how a DGS, extended with components, can be applied to geography teaching. For this purpose we have developed SLGeometry, an experimental platform for dynamic geometry, which supports extensibility via components. Through experiments, we confirmed the benefits of our approach in practice.